NCERT Solution for Class 9 Science Chapter 1
Matter in Our Surroundings
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-3
Questions No-1
Which of the following are matter? Chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume.
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Anything that occupies space and has mass is called matter. Matter can exist in three physical states—solid, liquid, and gaseous.
Chair and almond are forms of matter in the solid state.
Cold drink is a liquid state of matter.
Air and smell of perfume are gaseous states of matter.
Note: The sense of smell is not matter. However, the smell or odour of a substance is classified as matter. The smell of any substance (say, perfume) is the gaseous form of that substance which our olfactory system can detect (even at very low concentrations). Hence, smell of perfume is matter.
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Chair, air, almonds, and cold-drink.
Chair, air, almonds and cold drink
Matter refers to any object that takes up space and has weight.
>> Chair: Matter forms a part of a chair. It has weight as well as volume
>> Air: Yes, air is matter. It is made up of invisible gases that take space and are heavy.
>> Love and hate: These are emotions or sentiments, which, as such, do not make up matter. Instead, they are psychological states rather than physical objects.
>> Smell: Smell itself is not matter. The perception of scents is merely the smell particles that are sensed in the air.
>> Almonds: Yes, almonds are matter. These are physical things which possess weight and occupy space.
>> Thought: These are basically mental processes that have no physical stuff and thus they cannot be perceived as a kind of matter.
>> Cold: Coldness, however, is simply a phenomenon, not substance. It’s without heat or with less amount of heat energy.
>> Cold drink: Matter in that case would be the drink itself, either hot or not hot. It’s the liquid with weight and volume.
>> Smell of perfume: Just like the smell, that of perfume are molecules sensed by a person’s nose and not matter as it exists itself.